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Spatial (Tbata) expression in mature medullary thymic epithelial cells

Saade, Murielle
Yammine, Miriam
Boulanger, Nicolas
Victorero, Genevieve
Vincentelli, Renaud
Penninger, Josef M.
Hollander, Georg A.
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Published in European Journal of Immunology. 2010, vol. 40, no. 2, p. 530-538
Abstract The Spatial gene is expressed in highly polarized cell types such as testis germ cells, brain neurons and thymic epithelial cells (TEC). Its expression was documented in testis and brain but poorly characterized in thymus. Here, we characterize for the first time Spatial-expressing TEC throughout ontogeny and adult mouse thymus. Spatial is expressed in thymic-fated domain by embryonic day E10.5 and persists in subcapsular, cortical, medullary epithelial cells and in MTS24(+) progenitor TEC. Using mouse strains in which thymocyte development is blocked at various stages, we show that Spatial expression is independent of thymocyte-derived signals during thymus organogenesis. Analyses on purified thymic cell subsets show that Spatial short isoforms are expressed in cortical TEC (cTEC) and mature medullary TEC (mTEC). Spatial long isoforms were detected in the same TEC population. Spatial presents a nuclear distribution specific to mature mTEC expressing UEA1 and Aire. Aire- and RANKL-deficient mice revealed that Spatial expression is drastically reduced in the thymus of these mutants. These findings reveal a critical function of Aire in regulating Spatial expression, which is compatible with promiscuous Spatial gene expression.
Keywords AnimalsAntigens, Surface/genetics/metabolismEmbryo, Mammalian/cytology/embryology/metabolismEpithelial Cells/*metabolismFemale*Gene Expression Regulation, DevelopmentalImmunohistochemistryIn Situ HybridizationMaleMembrane Glycoproteins/genetics/metabolismMiceMice, Inbred C57BLMice, KnockoutNuclear Proteins/*genetics/metabolismRANK Ligand/genetics/metabolismReceptor Activator of Nuclear Factor-kappa B/genetics/metabolismReverse Transcriptase Polymerase Chain ReactionSignal TransductionThymus Gland/embryology/growth & development/*metabolismTime FactorsTranscription Factors/genetics/metabolism
PMID: 19918778
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SAADE, Murielle et al. Spatial (Tbata) expression in mature medullary thymic epithelial cells. In: European Journal of Immunology, 2010, vol. 40, n° 2, p. 530-538. doi: 10.1002/eji.200939605 https://archive-ouverte.unige.ch/unige:21275

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Deposited on : 2012-05-23

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